Binding cover and envelope construction



Feb. 25, 1941. G. swlF-r BINDING COVER AND ENVELOPE CONSTRUCTION 2 Sheets-.Sheet l Filed Oct. 6, 1939v Feb. 25, 1941.

VG. swlF'r BINDING COVER AND ENVELOPE CONSTRUCTION Filed oct. 6, 1939 2 sheets-sheet 2 Patented Feb. 25, 1941 UNITED STATES PATENT OFFICE BINDING COVER AND ENVILOIErv CONSTRUCTION 14 Claims.

This invention relates to improvements in binding cover and envelope construction, andinits more specific aspects to a binder functioning to secure a plurality of sheets in assembled relation cna cover, combined with an 'envelope which may contain correspondence orother data relatedA to the subject-matter of the bound sheets.'

The uproposal of the present invention, while not limited thereto, was designedfor and'has particular application as a. binder nfortitle abstracts and like manuscripts, inthe lassembly'of which it was heretofore customary'tofastenthe plat into the abstract or else merel-yinsert' the plat between the sheets `of the abstract. When fastened into the abstract, the-tendency existed to reduce the plat to the usual legal size of the abstract pages and this reductionl often4 resulted inl adrawing scaled too smallr for f convenient working.l Fastening of the plat into the abstract further resulted in inconvenience toone Working with the papers in question as `it compelled' re*- peated reference back to the fastened plat for checking descriptions and like-operations.

Where the plat was merely insertedfbetweenV y the sheets it was easilylost during=hand1ing or filing of the abstract.

Accordingly in the construction. of an` effective abstract cover recognition must'begiven to the fact that the plat should be separateand de-.

3o` tached from the pages .of the abstract `so Ythat the drawing can be shown in convenient scale and so that it can be handled ffreely and placed alongside the abstract when working therewith. At the same time provision must be made for protection against loss of the plat and related papers containing pertinent dataV to thev ab. stracted title, for their retentionwith the .abstract during periods of ling, and for rendering the plat and related data readily accessible for use.

Accordingly an object of the presentinvention is the provision of a combined binder and en-l velope of improved construction whichprovides binding means and a cover for the sheets .tobe

bound and also providing a readily accessible receptacle or envelope for -containingplatsl drawings, correspondence and other data pertinent to the subject-matter of the bound sheets.: A further object is the provision ofa .combined binder and envelope construction whichmay be inexpensively manufactured, which is durable in use, and by which sheets may bebound in simple manner and data and correspondence perti1 nentV thereto maybe retained therewithzduring ling and other periods in such mannerftha'tfall of the relatedmaterial is suitably protected and at theesame `time readily accessible for use. A further vobject is the provision of a binding cover for sheets to be bound, which is so constructed and arranged as to give adequate protection to 5 the bound sheets, to improve their appearance, and to protect the bound sheets from falling away from the cover when the binder is led on edge.

Other objectswill be in part obvious and in part hereinafter pointed out in connection with the following analysis of this invention wherein is illustrated an embodiment of the invention in detail.

In the drawings- Fig. 1 is 'a plan View of one form of binding cover and envelope construction of the present invention;

Fig. 2 is a section taken along line 2 2 of Fig.

Fig. 3 is illustrative of an alternative arrangement of the binding flaps;

Fig. 4 is a face view ofthe blank from which the binder and envelope of Figs. 1 3 is formed;

Fig. 5 is a part face `'View of a blank-for a combined binder and envelope as aforesaid employing a modied form of binding flap;

Fig. Gis a section taken through the binding iiap constructed from a blank such as shown in Fig. 5;

Fig. '7 is a face View of a blank for forming another embodiment of combined binder and envelope in accordance with the present invention;

Fig. 8-is a section taken through a binder and envelope construction formed from the blank illustrated in Fig. 7;

Fig. 9 is a section along line 9--9 of Fig. 8;

Fig. 10 is a part face view of a blank for formingl albinder and envelope construction employing the binding flap arrangement as illustrated in Figs. 7 and 8 but utilizing a modified form of pocket for receiving the lower ends of the bound sheets;

Fig. 11 is a plan view of -a binder and envelope fabricated from a blanksuch as illustrated in Fig. 10;

Fig. 12 is a part transverse section of the binder and envelope illustratedin Fig. 11, being taken along line I2-|2.

Referring noW- to the drawings 'wherein like reference characters designate like parts throughout the several views, the combined binding cover andenvelope of the form-illustratedLin Figs. 1-4 is .generally `designa-ted atA l0 (Fig. 1) and serves as.afbinding'foralpluralityof `sheets Il secured 55 to binding flaps to be described as by pronged fasteners I2, I3.

By reference to Fig. 4 which is illustrative of a blank from which the binder and envelope of Fig. 1 is formed, the blank is cut as illustrated to provide a front cover sheet I5 (defined by a left hand fold line I6, a right hand fold line I1, a top fold line I3, and a bottom fold line 20), and a back sheet ZI (defined by right hand marginal edge 22, the fold line I'I, a top fold line 23, and a bottom marginal edge 24). As fold line 23 is in effect a continuation of fold line I8 and as the bottom marginal edge 24 is a continuation of fold line 20, it will be understood Vthat the Y length `of the front and back sheets I5, 2| is 5 the same, being somewhat greater than the length of the bound sheets I I. I5, 2l is substantially the same, being somewhat greater than the width of the bound sheets II,

so that when front sheet I5 is folded forwardly about line of fold I'I to overlie back sheet 2l, the'marginal edge 22 underlies the line of fold I6. Extending relatively upwardly of the. front sheet I5 is a binding flap 25 and extending upwardly of the back sheet 2I is a related binding Hap 26, said aps being adapted for folding in relatively forward direction along lines of fold I8, 2'3. The depth of the aps 25, 26 is in the form under description substantially the same, being sumcient to provide suitable anchorage for the fasteners I2, I3. The width of the flaps is substantially the width of the cover sheets from which they extend and hence is somewhat in excess of the width of the bound sheets I I.

Extending downwardly of the front sheet I5r and adapted for upward folding with reference thereto along aline of fold 20 is a bottom flap 28 of width substantially equal to that of the front sheet I5 and of substantial depth. The flap 28 for the greater portion of its depth is defined on its right hand edge by a line of fold 30 from which extends a Wind flap 3l.

Extending sidewardly of the front sheet I5 and adapted to be folded rearwardly thereof along the line of fold I6 is a strengthening flap 32 of substantial width and of depth substantially that of the front sheet. A

, Preferably the relatively under faces of the flaps 28 and 3| are coated with adhesive, pr-eferably during manufacture of the blank, as indicated by the cross-hatching. If desired, one or both of the adjacent faces'V of the binding flaps 25, 26 may also be coated with adhesive whereby these flaps, which engage in the manner illustrated in Fig. 2, can be adhesively secured together.

The front sheet I5 is provided with a slit 35 which extends in a straight line substantially across the sheet and hence is of 'somewhat greater length than the width of the bound sheets II. The slit 35 is spaced from the bottom edge of the binder as defined by the lin-e of fold 20 a sufcient distance as to provide a pocket of substantial depth for the reception of the bottom end portions of the bound sheets II. It will be here noted that the depth of wing flap 3l is somewhatv less than the spacing between slit 35 and line of fold 20 so that the flap in final position will not overlap the slit 35. l

In setting up the combined binding cover and envelope blank illustrated in Fig. 4, `front sheet I5 is folded forwardly along the line of fold I'I and to la. position overlying the back sheet. Thereupon bottom flap 28 is folded-rearwardly along line of fold v2l) to` underlie the back "sheet The width of said sheets 2l and is glued by its adhesive coat to the back face of the back sheet 2|, thus to close the botltom of the structure, the bottom edge of which is now defined by the line of fold 20.

The side wing flap 3i may now be folded relatively forwardly along line of fold 36 and is glued to th-e front face of the front sheet I5 which it overlies. The flap 3| serves not only to strengthen the pocket but also reinforces the binding cover along an edge which would receive wear during edge filing.

Flap 32 may now be folded inwardly along line of fold I6 tolie between the front and back ysheets I5, 2l, respectively. While no gluing of .thefflap 32 to the front sheet is contemplated,

nevertheless the ap 32 provides strengthening and reinforcing properties and further acts to protect one right hand edge of the cover as defined by the line of fold I6.

Binding flaps 25, 26 may now be bent relatively forwardly along fold lines I8, 23 to a position which Athey Yoverlie front sheet I5 as indicatedin Figs.` 2 and 3. If the aps are to be adhesively secured, they are glued together along their meeting faces to close the top of the structure, the top edge of which is new defined by the lines of fold I3, 23. Preferably, however, the aps are unglued, lin which case reliance for securement lof the flaps is placed on the fastenersv I2, I3 which ext-end therethrough and also through the sheets II to be bound, hence to secure the latter to the cover.

, Upon vproper assembly and relation of the sheets to be bound, the top edge of the latter may be inserted into Ithe recess or mouth formed by the yoverhanging and preferably unglued flaps 2 5, 25, as indicated in Fig. 2, Thereupon suitable fasteners such as the pronged fasteners I2, I3 are passed through the flaps and Vsheets II, the bent prong ends in this instance being covered both the front and .the back sheets of the cover; It will be understood of course that the prongs mayalso be passed through the'said front andv back cover sheets and their ends bent against the rear face of the cover back sheet.

In Fig. 3 an alternative arrangement of securing and binding the sheets to the flaps 25, 26 is illustrated. According to this alternative proposal, the flaps 25, 26 are glued togetherl and the top portions of the sheets I I are inserted into the gap provided between the secured flaps 25, 26 and the front .cover sheet. Upon passing the fasteners I2, I3 through the glued flaps, the intermediate sheets being bound, and both cover sheets,H the prongsV thereof may be bent against the rear face of the back cover sheet. The lower edge portions of the bound sheets II may now .'be inserted through the pocket mouth provided by the slit 35 and into the pocket formed along the lower edge of the cover. Such avpocket'construction is beneficial not only for protecting the'l'ower'edge portions of theV bound sheets but also prevents the boundV sheetsV from falling away from thecover when'the cover and sheets are filed on edge.

l It will lbe noted that the front and back sheets according to the above described construction, while secured valong their top and bottom edge and'along the left side, are left unsecured along the right edge thereof. Accordingly this'arrangement provides not only a binding and cover but also an'open-sided envelope adapted to receive plats,` correspondence, and/or data pertinent to thesubject-matter of the bound sheets. Itis further'se-en that'the envelope and'its opening is readily accessible to one Working with the bound sheets and at the same time provides a pocket or envelope in which additional material not `susceptible to binding may be retained with the binder and thus protected against loss, misplacement andthe like.

`Referring now to the modified binding arrangement illustratedin Figs. 5 and 6, the blank shown in Fig. 5 is the same as illustrated in Fig. 4 with the-exception of the binding flap arrangement employed in the modification currently under description. In the modified construction, the front sheet I5 is provided with a ap 25a similar tothe ilap 25 of the Fig. 4 blank. The back sheet 2l, however, is provided with a fiap of depth substantially three times the'depthof the-flap 25a, thus upon appropriate bending to provide ap plies 25a, 25h, 25e. In assembling a binding cover from the Fig. 5 form of blank, front cover sheet I5 is folded to overlie'theback sheet 2l, thus bringing nap 25a. onto flap-ply 25a. Glue or like adhesive is applied to flap-ply 26D, and the latter is folded downwardly along line of fold 23a and glued to flap 25a. Flap-ply 25e isl now folded upwardly along line of fold 23h. Thereupon, the entire flap structure composed of the several plies is folded forwardly along the line of fold 25. By such a ply arrangement, the flap 25a is interleaved between the plies 25a, 251)l in the manner illustrated in Fig. 6.

As will be further seen in Fig. 6, there is provideda gap between the plies `26h, 26e of the back sheet carried flap, in which the top edge portions of the sheets II to be bound may be inserted.

, Thereupon pronged fasteners such as I2, i3 may 42, 43, 44, and a front sheet 45 defined by the i left hand marginal edge 45, the line of fold 4I, the bottom marginal edge 41, and a top line of fold 48.

Extending upwardly of the back sheet 4I) is a flap 50, and extending upwardly from the front sheet 45 is a flap 5I, both said flaps corresponding to the flaps 25, 250i the Fig. 4 blank.

The back sheet 4u is provided with a ap 52 adapted to fold forwardly of the back` sheet along line'of fold 42 and servesto protect and reinforce said sheet along this line of fold.

Carried by the back sheet 40 and adapted to fold upwardly relative thereto along the line of fold 44 is a pocket-forming flap 54said flap extending the full width of the back sheet and being defined laterally by lines of fold 55, 55 which are, respectively, continuations of the lines of fold 4I, 42. The pocket-forming ap 54 is provided at each side thereof with securing flaps 58, 6|) each adapted to fold relatively forwardly of the flap 54 along the lines of fold 55, 55. As will be seen from the drawings, flaps 53, Gil extend substantially the full depth'of flap 54.

In setting up a binding coverand envelope from the blank illustrated in Fig. '7, the front sheet 45 is folded over the back sheet 40 along the line of fold 4I. Longitudinal side flap 52 may nowibe folded inwardly of the back sheet ll'along line offold. 42, to take up la position intermediate-the front and back sheets 45, 40, respectively. Bottom iiap 541 may now be folded relatively upwardly along line of foldA 4.4 to overlie'the front sheet 45 in the manner indicated in Figs. 8 and 9, whereupon Wing naps 58, 653 are bent relatively rearwardly along lines of folds 55, 55. Flap 58 is adapted to engage against the rear face of the back sheet 40 and is glued to the latter. On the other hand, the right hand nap 55 is folded over edge 46 of the front sheet, being positioned between saidV sheet and the kbacksheet inthey manner indicated in Fig. 9. Said flap 5i! is thereupon glued to the rear face of the front sheet 45.

Flaps 50, 5I` may now be bent forwardly along the related lines of fold 43, 48. Said flaps are preferably. ungluedzand the sheets I I to be bound are secured therebetween in the manner indicated in Fig. 2. If glued together, lthe binding corresponds to that illustrated in Fig. 3.

In such a construction as last above described, the lower edges of the bound sheets may be projected into the pocket formed adjacent thebottorn of the binding cover by the described relationship of flap 54 and front sheet 55 thereof. As with the previously described constructions, the cover under description. is provided by front and back sheets which are secured together along their top, bottom. and` one side edges, being unsecured along their other edge such as their right edge. Accordingly an open-sided envelope construction, is provided which is adapted to receive and store drawings, correspondence, data and the like which pertain to the subject-matter of the sheets bound by the binding flaps.

The cover and envelope illustrated in Fig. l1, a part-blank for which is illustrated in Fig. 10, embodies the same general principles employed in the cover and envelope illustrated in Figs. 7-9. In the latter embodiment, however, securing flaps such asi the flaps 58, 5l) are dispensed with, and the pocket securing nap 54a is defined laterally by the marginal edges 55a, 55a.. In setting up the binding cover and envelope from the blank illustrated in Fig. 10, the same operations arepracticed as in setting up a structure from the Fig. '7 blank up to the point of bending and securing flaps 58, 65. Fromthis point, flap 54o'. is secured along its left marginal edge 55a to the back face of the back sheet 45a as by a strip of gummed fabric 62 as indicated in Figs. l1 and 12. Similarly, flap 54a along its right marginal edge 55a is secured to the front sheet 45a and to the under face thereof by a similar strip of gummed fabric 63. Upon securement being eifected as aforesaid, a pocket adapted to receive the lower ends of' the bound sheets is provided between the relatively inner face of flap 54a and the relatively front face of the front sheet 45a.

Preferably, the blanks above described from which the combined binding cover and envelope is fabricated as aforesaid are cut from a fab-ric material, thus to provide a cover and envelope of relatively long life under hard conditions of usage. It will be understood, however, that materials other than fabric may be employed, such as heavy paper of the character employed in conventional bindings.

It is further to be understood that minor changes may be made in the above described constructions without departing from the scope of this invention. For example, the flaps 32 and 52 may be omitted entirely.` On the other hand, a flap analogous to the flap 52 may be provided along the marginal edge 22 of the back sheet' (Fig.

4') thus to protect this raw edge'of the envelope mouth. Similarly a flap such as the flap 32 may be provided along the marginal edge 46 of the blank illustrated in Fig. 7, thus to protect and reinforce this raw or cut edge of the envelope mouth.

Hence, as the above and other changes could be made in carrying out the -above constructions without departing from the scope of the invention, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

I claim:

1. A binding cover and envelope construction fabricated from a blank cut and folded to form front and back cover sheets secured together Valong a common line of fold which constitutes one side edge of the construction, means securing said cover sheets together along their bottom edges, a binding flap extending from the top edge of each of said cover sheets, said flaps being folded to overlie the front sheet along a line of fold constituting the top edge of the construction, means adapted to secure a plurality of sheets to be bound to said binding flaps and functioning also to secure the flaps together, said cover sheets havings cooperating means forming with said front sheet an upwardly opening ypocket adapted to receive the lower portions of the bound sheets, the front and back cover sheets being unsecured along their other side edges whereby said sheets form an open-sided envelope.

2. A binding cover and envelope construction fabricated fro-rn Ia blank cut and folded to form front and back cover sheets secured together along a common line of fold which constitutes one side edge of the construction, one of said cover sheets carrying means for securing said sheets together along their related bottom edges, a binding flap extending from the top edge of each of said cover sheets, said flaps being folded to overlie the front sheet along a line of fold constituting the top edge of the construction, means adapted to secure a plurality of sheets to be bound tofsaid binding flaps and functioning also to secure the flaps together, said cover sheets having cooperating means forming with said front sheet an upwardly opening pocket adapted to receive the lower portions of the bound sheets, the front and back cover sheets being unsecured along their other side edges whereby said sheets form an open-sided envelope.

3. A binding cover and envelope construction fabricated from a blank cut and folded to form front and back cover' sheets secured together along a common line of fold which constitutes one side edge of the construction, one of said cover sheets carrying means for securing said sheets together along their related bottomedges, a binding ap of substantially uniform depth and of width approximating that of the sheets extending frorn the top edge of each cover sheet, said flaps being folded to overlie the front cover sheet along a line of fold constituting the top edge of said construction, means `adapted to se cure a plurality of sheets to be bound to said flaps and functioning Ialso to secure the `flaps together, said cover sheets having cooperating means forming with said front cover sheet an upwardly opening pocket adapted to receive the lower portions of the bound sheets, the front and back cover sheets being unsecured along their other side edges whereby said sheets forman Vopen-sided envelope.'

4. A binding cover and'envelope construction fabricated from a blank cut and folded to form front and back cover sheets securedv together along a common line of fold which constitutes one side edge of the construction, one` of said cover sheets carrying means for securing said sheets together along their related bottom edges, a binding flap extending from the top edge of each of said cover sheets, said flaps being `folded to overlie the front sheet along a line of fold constituting the top edge of the construction, the binding flap of one sheet being of substantially greater depth than the binding flap of the other sheet and being folded on itself,V the binding flap of said other sheet being interleaved with said first flap, means adapted to secure a plu, rality of sheets to be Afound to said binding flaps, said front and back sheets having cooperatingmeans forming with said front sheet anupward-v ly opening pocket adapted to receive the lower portions of 'thebound sheets, the front and back cover sheets being unsecured along their other side edges, whereby said sheets form an open-V sided envelope.

5. A binding cover and envelope construction fabricated from a blank cut and folded to form front and back cover sheets secured together along a common line of fold which constitutes one side edge of the construction, one of said cover sheets carrying means for securing said sheets together lalong their related bottom edges, a binding ap extending from the top edge of each of said cover sheets, said flaps being folded to overlie the front sheet along a line of Afold constituting the top edge of the construction, the binding flap of one cover sheet being bent on itself to form a plurality of binding plies, the binding flap of the other cover sheet constituting a single ply adapted to be interleaved with the multi-ply iiap, means adapted to secureya plurality'of sheets to be bound to said binding iaps, said cover sheets having cooperating means forming with the front sheet an upwardly opening pocket adapted to receive the lower portions of the bound sheets, the Vfront and back cover sheets being unsecured along their other side edges whereby said sheets form an open-sided flaps being folded to overlie the front sheet along a line of fold constituting the top edge of the construction, the single-ply flap being interleaved with the plies of the multi-ply flap, means for securing a plurality of sheets to be bound to said binding flaps, said cover sheets having cooperating means forming with the front sheet 4 an upwardly opening pocket adapted to receive the lower portions of the bound sheets, the front and back cover sheets being unsecured along their other side edges whereby said sheets form an open-sided envelope.

7. A binding cover and envelope construction fabricated from a blank cut and folded to form front andb-ack cover sheets secured together along a common line of fold constituting one side l edge of the construction, a binding flap extend-f lingr upwardly. from each cover sheet andbeing folded along a line of fold constituting the top edge of said construction to overlie the front cover sheet, Ameans for securing the sheets to be 'bound to said binding flaps, .one of said cover sheets having a flap extending the full width 'thereof from its bottom edge, said nap being folded alongfa line of fold constituting the bot- Itom edge of` said construction into facing relation with said other cover sheet and being secured to vsaid other cover sheet whereby to secure said cover sheets together along their related bottom edges, said cover sheets being unsecured along their other side edges whereby said sheets form an open-sidedenvelope.

8.- A binding cover and" envelope construction fabricated from a blank cut and 'folded to form front and back cover sheets secured together along a common line of fold lconstituting one iside' edge of the construction, a binding flap extending upwardly from each cover sheet and being folded along a line of fold constituting the top edge of said construction to overlie the front cover sheet, means for securing the sheets to be bound to said binding flaps, said front cover sheet having a flap extending the full width thereof from its bottom edge, said bottom ap being folded to underlie the back cover sheet along a line of mold constituting the bottom edge of said construction and being secured to the rear face of said back sheet thereby to secure said cover sheets together along their related bottom edges, said cover sheets being unsecured along their other side edges whereby said sheets form an open-sided envelope.

9. A binding cover and envelope construction fabricated from a blank cut and folded to form front and back cover sheets secured together along a common line of fold constituting one side edge of the construction, a binding flap extending upwardly from each cover sheet and being folded along a line of fold constituting the top edge of said construction to overlie the front cover sheet, means for securing the sheets to be bound to said binding flaps, said front cover sheet having a flap extending the full width thereof from its bottom edge, said flap being folded to underlie the back cover sheet along a line of fold constituting the bottom edge of the construction and being secured to the rear face of the back sheet thereby to secure said cover sheets together along their related bottom edges, the front cover sheet having a transverse slit extending substan tially the width thereof, said slit being spaced from said bottom edge and forming the mouth of 4a pocket provided by said front and back cover sheets along the aforesaid bottom edge, said pocket being adapted to receive the bottom ends of the bound sheets, the front and back cover sheets being unsecured along their other side edge whereby said sheets form an open-sided envelope.

10. A binding cover and envelope construction fabricated from a blank cut and folded to form front and back cover sheets secured together along a common line of fold constituting one side edge of the construction, a binding flap extending upwardly from each cover sheet and being folded along a line of fold constituting the top edge of said construction to overlie the front cover sheet, means for securing the sheets to be bound to said binding flaps, said front cover sheet having a flap extending the full width thereof from its bottom edge, said bottom ap having a wing flap extending laterally therefrom which is folded over :the closed side edge of theconstructio-n to overlie the front cover sheet, said bottom iiap being .secured to the rear` face of the back sheet and said lwing flap being rsecured to the front face of the' front .sheet thereby to secure said cover sheets 'together along their related bottom edges, the

front sheet having a transverse slit extending substantially the width thereof, said slit being spaced from said bottom edge and providing an upwardlyA opening mouth for a pocket formed by said front and back sheets above the aforesaid bottom edge, the cover sheets being unsecured along their rother side edges whereby said sheetsform an open-sided envelope.

11. A binding cover and envelope construction fabricated from a blank cut and folded to form frontv and back cover sheets secured together along va common line of fold constituting one side ledge of the construction, a binding ap extending upwardly from each cover sheet and bel ing folded along a line of fold constituting the top edge of said construction to overlie the front cover sheet, means `for securing the sheets to be bound to said binding flaps, the back sheet having a flap extending the full width thereof from its bottom edge and folded to overlie the front sheet along a line of fold constituting the bottom edge of said construction, means securing the bottom flap along its side edges to the cover sheets, whereby to secure the cover sheets together along their bottom edges and whereby said bottom flap forms with the front cover sheet an upwardly opening pocket adapted to receive the bottom ends of the bound sheets, the front and back cover sheets being unsecured along their oth-er side edges whereby said sheets form an open-sided envelope.

12. A binding cover and envelope construction fabricated from a blank cut and folded to form front and back cover sheets secured together along a common line of fold constituting one side edge of the construction, a binding flap extending upwardly from each cover sheet and being folded along a line of fold constituting the top edge of sai-d construction to overlie the front cover sheet, means for securing the sheets to be bound to said binding flaps, the back sheet having a flap extending the full width thereof from its bottom edge and folded to overlie the front sheet along a line of fold constituting the bottom edge of said construction, means securing the bottom flap along one side edge corresponding to the closed side edge of the construction to the rear face of the back cover sheet and along its other side edge to the rear face of the front cover sheet, thereby to secure the cover sheets together along their related bottom edges and whereby said bottom flap forms with the front cover sheet an upwardly opening pocket adapted to receive the bottom ends of the bound sheets, the front and back cover sheets being unsecured along their other side edges whereby said sheets form an open-sided envelope.

13. A binding cover and envelope construction fabricated from a blank cut and folded to form front and back cover sheets secured together along a common line of fold constituting one side edge of the construction, a binding flap extending upwardly from each cover sheet and being folded along a line of fold constituting the top edge of said construction to overlie the front cover sheet, means for securing the sheets to be bound to said binding flaps, the back sheet having a flap extending the full Width thereof from its bottom edge and folded to overlie the front sheet along a line of fold constituting'the bottom edge of said construction, a Wing flap extending from the bottom flap at each side thereof, one wing flap being folded over the closed side edge of the construction and being secured to the rear face of the' back sheet and the other wing flap being folded over the free edge of the front sheet and being secured to the rear face of the latter, thereby to secure the cover sheets together along their bottom edges and whereby said flap forms with the front cover sheet an upwardly opening pocket a-dapted to receive the bottom ends of the bound sheets, the front and back cover sheets being unsecured along their other side edges whereby said sheets form an open-sided envelope.

14. A binding cover and envelope construction fabricated from a blank cut and folded to form front and yback cover sheets secured together along a common line of fold constituting one side edge of the construction, a binding flap extending upwardly from each cover sheet and being-folded along aline of fold constituting the top edge of said constructionV to overlie the front cover sheet, means for securing the sheets to be bound to said binding flaps, the back sheet having a flap extending the full width thereof from its bottom edge and folded to overlie the front sheet along a line of fold constituting the bottom edge of said construction, a securing strip for securing one side edge of the ap to the under face Aof the GLENN SWIFT. 2o 

